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Christopher Victor Grupe, 46, had a rocky relationship with his employers: in December 2015, he was suspended for 12 days for insubordination and just not making the grade as a sysadmin. After sitting on the naughty step, he returned to the office on December 15 to be told he was being let go, and this got him rather fired up.
Grupe removed administrator-level accounts, deleted certain key files, and changed the passwords for other accounts on the networking hardware, a US district court jury in Minnesota heard.
On January 5, the network hit the buffers. IT staff at CPR tried to log into the switches, and found they were locked out. According to court documents parts of the system went down, and staff had to force reboot, and presumably factory reset, all the switches to regain access to the equipment.